Middlings-purifier



(No Model.) 3 Sheets-Sheet l.

A. HEINE. MIDDLINGS PURIPIER. No. 382,878. Patented May 15, 1888.

.bforraega (No Model.) 3 sheetssheet :2. A. HEINE.

MIDDLINGS PURIPIER.

No. 382,873. Patented May 15, 1888.

(No Model.) -3 Sheets-Sheet 3 A. HEINE.

MIDDLINGS PURIPIBR. y No'. 382,873. Patented May 15, 1888.

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UNITED STATES PATENT OEEICE.

AUGUST HEINE, OF SILVER CREEK, NEV YORK.

MIDDLINGS-PURIFIER.

SPECIFICATION forming'part of Letters Patent; No. 382,873, dated May 15, 1888.

Application filed April 1, 1887. Serial No. 233,290.

(No model.)

State of N ew York, have invented a new and useful Improvement in Middliugs-Puritiers, of which the following is a specification.

This invention relates to that class of midd dlings-puriers which are provided with a shaking-screen through which an air-current passes, whereby the light impurities are removed from the material passing over the screen; and it has for its object to provide simple means for separating these light impurities from the air and to providesimple means for keeping the meshes of the screen open, thereby maintaining a proper and uniform action of the air-currents in the machine. In middlings-purifiers of this general character the light impurities in ascending through the air-passage above the screen frequently form aggregrations or flakes of greater or less bulk, which, being too heavy to be further lifted by the air-current, fall back upon the material upon the screen, and in this manner escape the separating action of the machine.

My invention is designed to remedy this difculty; and it consists of the improvements which will be hereinafter fully described, and pointed out in the claims.

of three sheets, Figure lis a longitudinal sectional elevation of a middlings-purier provided with my improvements. Fig. 2 is a horizontal section ofthe machine taken above the screen. Fig. 3 is a side elevation of the machine. Fig. 4 is a horizontal section inline mx, Fig. 1. Fig. 5 is a cross-section of the machine. Fig. 6 is an elevation of the tail end of the machine. Fig. 7 isa vertical crosssection of the lower portions of two of the dustco1lectiug chambers on an enlarged scale. Fig. 8 is a fragmentary perspective view of one of the perforated walls of the dust-collecting troughs. Fig. 9 is a similar view showing a modified construction of said walls. Fig.4 l0 is a perspective view of one ofthe dust-collecting chambers.

Like letters of reference refer to like parts in the several figures.

A represents the stationary frame of the machine, and a the shalting-screen, arranged in the lower portion of the frame in the usual manner.

In the accompanying drawings, consisting B represents the hopper-shaped receptacle arranged underneath the screen for the reception of the material which passes through the screen, and provided with the usual conveyers, b b'.

C represents the casing arranged above the screen and inclosin g the air-passage C', through which the dust-laden air passes from the screen to the fan D, by which the air-currcnt is set in motion inthe usual manner.

E represents the feedlbox from which the material to be purified is delivered upon the head of the shakingscreen a, and E represents the discharge-spout through which the tailings escape from the machine.

F F F2 F3 represent dust-separating chambers supported in the upper portion of the casing Gand depending into the same. Each separating-chamber consists of two compartments formed by top bars, ff', depending end pieces,f2, two longitudinal bars,ff"",arranged side by side and connecting the lower ends of the end pieces, f2, and suitable iiltercloths f4 f4. The latter extend each from one top bar, f, down to and around one of the lower bars, f3, and thence upwardly to the upper bar, f. The two barsf of two adjacent compartments lie closely against each other,while the lower bars, f3, are separated. The two compartments of each chamber are separated by a space, f 5, through which the dustladen air enters between the compartments.

Each chamber is secured to the inner side of the casing C by screws g, or other suitable means. The inlet-spout d of the fan is connected with the casing C above the chambers F F F2 F3, as represented in Fig. l, and is provided with a suitable valve, d', for regulating the strength and volume of the air-current.

hh hzha represent movable gates or valves attached to the open tops of the respective chambers, so as to alternately open and close the same. These gates are opened and closed by cams iit'z i, which engage against hooks attached to the gates. The cams are secured to a transverse shaft, I, which is rotated by a pulley, j, and endless belt j', or other suitable means. Ihe cams are so arranged on. the shaft that one of the gates is closed while the other gates are open, thereby permitting the cleaning of the filter-cloth of the chamber which is cut oft' from the air-current while the other chambers are in operation.

The cams are con- IOC) structed to drop the gates suddenly or with a jar, whereby the dust is dislodged from the filter-cloth; but, if desired, the separatingchambers may be jarred by any other suitable means.

K K K2 K3 represent troughs arranged lengthwise underneath the dust-separating chambers F F F2 F3 and constructed with inclined perforated side walls,through which the dust-laden air passes upwardly from the screen to the dust separating chambers. These troughs form a diaphragm across the air-passage G' between the screen and the dust-sepa.

rating ehambers,which prevents the dust after having'passed through this diaphragm from falling back upon the screen. The side walls, 7c, of these troughs are preferably constructed of metal, having corrugations 7c', arranged side by side in vertical planes, each corrugation being provided in its crown line with perforations k2. The air-currents ascending from the screen gradually increase in force in the up wardly-converging passages formed between inclined side walls of the troughs and in the perforations with which the side walls are provided, whereby the force ofthe aircurrents is increased in the same measure as the weight of the dust is liable to increase by aggregation, and whereby the flakes or aggregations of dust particles are prevented from overcoming the force of the air-currents and falling back upon the screen. The air-currents issuing from the perforations k? are weakened by expansion above the diaphragm formed by the troughs, whereby the heavier -dust particles are caused to drop out of the air-currents upon the troughs, from which latter the dust is removed by conveyers l, of any suitable construction,which deliver the dust to a transverse conveycr, Z. The corrugations in the side walls of the trough cause the dust particles to be collected in the depressions between the rows ot' perforations and prevent the dust particles from falling through the perforations.

As afurther safeguard, the perforations may be provided with raised burrs or edges on the upper sides of the plates, as represented in Fig. 7. The dust which is dislodged from the cloths of the separating-chambers is also collected upon the tight bottoms Z2 of the troughs and is removed by the conveyers Z. These troughs, or the zigzag diaphragm formed by the troughs, effect a preliminary sepa* ration of the heavier impurities from the aircurrent before the latter reaches the separat ing-chambers, whereby the latter are relieved to that extent and required only to separate the lighter dust particles from the air-current. It is obvious that slots may be substituted for the perforations,asindicated inFig.9.

m represents cords or bands arranged lengthwise on the shaking-screen a, and secured with their rear ends to the frame thereof, while their front ends are secured to a crossbar, n, or support which is independent of the screen. rlhis cross-bar is suspended by hangers N, which are pivoted at their upper ends to the easing above the screen, and which receive an oscillating motion by eccentrics o engaging in yokes o on the hangers, and secured to a transverse shaft, of'. The latter' is rotated by a pulley, o, or other suitable means. short reciprocating movement toward and from the tail of the screen, whereby the cords m are alternately loosened and tightened. The cross-bar n is slightly elevated above the screen, so that when the cords are tightened they are lifted above the screen, and do not come in contact with the cloth of the same. When the cords are slack, they rest upon the Y screen and assume asinuous or serpentine mo tion by the shaking motion of the screen,

Ywhereby the meshes of the screen are freed from any particles which may have lodged in the same.

By holding the cords part of the time in a elevated position above the screen the wear upon the boltingcloth is considerably reduced.

I claim as my invention-M 1. rlhe combination,with the casing through which the dust-laden air passes, of 'a diaphragm extending across said casing and com- -posed of a series of dust-collecting troughs having the upper portions of their side walls perforated, and a series of dust-collecting chambers arranged in said casing above the said diaphragm, substantially as set forth.

2. The com bination,with the casing through which the dustladeu air passes, of a diaphragm arranged across said casing and provided with inclined side walls having upright corrugations, and airrpassages in the crown portions of said corrugations, and dust-col1 lectingr chambers arranged in said casing above said diaphragm, substantially as set forth.

3. The combination,with the casing through which the dust-laden air passes, of a dust-col lecting chamber depending into said casing, open at its top, closed at its bottom, and having its sides covered with filter-cloth, a vertically-movable gate applied to the upper end of said dust-collecting chamber, and a cam whereby the gate is raised and then suddenly dropped, thereby shutting off the air-current andjarring the chamber, substantially as set forth.

1t. The combinatiomwith the shaking screen, of cleaning-cords arranged on the screen and secured at one end to the screen, and a support to which the opposite ends of the cords are secured, and which moves independent of the screen, whereby the cords are at intervals loosened to rest on the screen and tightened to be lifted clear of the screen, substantially as set forth.

fitness my hand this 25th day of March, 1887.

Vitnesses:

I. D. Malmrrr, G. B. DoUGLAs.

AUGUST HEINE.

The crossbar a receives a IIO 

